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# IoT Geiger counter with ESP32, OLED display and thingspeak channel # IoT Geiger counter with ESP32, OLED display and thingspeak channel
- Low power mode for battery power supply with OLED display and click sounds, WiFi off - Low power mode for battery power supply with OLED display and click sounds, WiFi off
- WiFi mode for thingspeak data upload every minute using WiFi (channel https://thingspeak.com/channels/758223) - WiFi mode for thingspeak data upload every minute using WiFi => https://thingspeak.com/channels/758223
[![https://thingspeak.com/channels/758223](media/thingspeak.png)](https://thingspeak.com/channels/758223) [![https://thingspeak.com/channels/758223](media/thingspeak.png)](https://thingspeak.com/channels/758223)
![Circuit Board](media/geiger-counter-pcb.jpg) ![Circuit Board](media/geiger-counter-pcb.jpg)
Feel free to use this project as a base for your own projects AT YOUR OWN RISK!
# Hardware # Hardware
- Russian Geiger counter tube STS-6 at 400 V with ~5 MOhm - Russian Geiger counter tube STS-6 at 400 V with ~5 MOhm
- High voltage circuit from ArnoR at mikrocontroller.net https://www.mikrocontroller.net/topic/380666, schematic https://www.mikrocontroller.net/attachment/273334/HystereseStepUpTLC555-2.png - High voltage circuit from ArnoR at mikrocontroller.net https://www.mikrocontroller.net/topic/380666, schematic https://www.mikrocontroller.net/attachment/273334/HystereseStepUpTLC555-2.png. *Keep the high-voltage capacitor small to avoid dangerous charges!*
- ~400 µs pulses generation using voltage divider, darlington transistor and TLC 555 timer - ~400 µs pulse generation using voltage divider, darlington transistor and TLC 555 timer
- ESP32 board Wemos Lolin32 - ESP32 board Wemos Lolin32
- OLED 128x64 with controller SH1106 at I2C - OLED 128x64 with controller SH1106 at I2C
- Voltage supply from USB or power supply or 3x1.5V AAA batteries, works from 3.0 V up to 5.0 V - Voltage supply from either USB or power supply or 3x 1.5V AAA batteries, circuit works from 3.0 V up to 5.0 V
- Pulse input is expected at GPIO 18 (high pulses with at least about 250 µs length)
- Switch for WiFi mode is expected at GPIO 4 (low=WiFi mode, high=low-power mode)
- OLED I2C bus is expected at GPIO 22 (SCK) and 21 (SDA)
# Software # Software
- Eclipse sloeber project using Arduino library, ESP-IDF for sleep functions and u8g2 for display output - Eclipse sloeber project using Arduino library, ESP-IDF for sleep functions and u8g2 for display output
- Low-power mode uses light sleep, a wake-up for each signal pulse change and a wake-up every 1000 ms to update pulse statistics and OLED. This results in about 90% sleep. Could be improved using deep sleep and ULP. However, light sleep is already quite good and much easier.
- WiFi mode uses no sleep and simple interrupts for pulse counting. Pulse statistics and OLED are updated every 1000 ms, data is sent to thingspeak every 60 s.
- Credentials (WiFi SSID, password, thingspeak channel key) are only declared in {credentials.h} and must be defined in a {credentials.cpp}